Over one thousand years prior to the game's events, Reeve was formed by a small group of immigrants from the eastern continent of Jugd who crossed over the Reeve River. The settlers established four dukedoms (Rivellia, Zemseria, Razelia, and Nolzeria) which were later united as the Republic of Reeve. Fearing the growing power of these outsiders, the native people of Zoa launched an attack against Reeve, starting a war between the two factions. Within only five years, the Reevan official Denoas conquered all of the Zoan clans. After the Zoan clan leader Kalbazan drank Miradona's blood and became the dark dragon Gerxel, he annihilated Reeve within one year. However, the hero Carluon eventually defeated him with Utna's help. Afterwards, Carluon and Utna became the rulers of the Reeve Empire.

After Carluon's death, the nobles and senators divided the Empire into four kingdoms: Reeve, Salia, Canaan, and Leda. The Kingdom of Reeve was ruled by the descendants of one of Carluon's daughters, Reeve. Throughout the years, it continued to persecute the Zoans by publicly executing them and enslaving their children. The recent king ignored the corruption and tyranny of the Reevan nobility and continually betrayed the trust of other kingdoms, resulting in a war. It was eventually invaded by the reborn Zoa Empire, and collapsed after the Tragedy of Nolzeria, in which Lord Glamdr of Razelia and Prince Arless of Canaan were killed by the Water Dragon, Muse.

The only surviving direct member of the royal family is Princess Maeve. The queen died of grief after Maeve was kidnapped by Naris to be used for his own political ambitions. Rentzenheimer, the son of Duke Dolmu of Zemseria, is related to the royal family through his mother.